/discover — Stage 2: Ideator + Parallel Explore-Exploit

Arguments: $ARGUMENTS

Current state: !python3 .claude/scripts/ledger.py status

Preconditions: resolve the run (--run or ACTIVE_RUN); brief.md and a valid bibliography.jsonl must exist — otherwise stop and point to /investigate. Read B and I from run-config.json (--iterations here overrides I; create missing iterations/iN/branches/bK dirs as needed).

For each iteration iN:

1. Launch ideator (run dir, iN, B, prior distilled-feedback.md files if any — also from previous /discover invocations). Expect ideas.md + proposals/p1..pB.md. From i2 on the ideator applies top-K retention (p1..pK refine the previous iteration's top-K surviving branches).
2. Launch ALL B solver subagents IN ONE MESSAGE — one Agent call per branch, each given only its own iterations/iN/branches/bK/ dir and proposals/pK.md. This parallel fan-out is the point of PEE; sequential launches are a protocol violation.
3. When all solvers are done: launch B evaluator subagents in one message.
4. Then B auditor subagents in one message.
5. Rank + Select (you): read all eval.json + audit.md; audit-FAIL branches are disqualified regardless of score; write iterations/iN/ranking.md (table + rationale).
6. Distilled feedback (you): invoke the distill-feedback skill (Skill tool, skill: distill-feedback) and write iterations/iN/distilled-feedback.md with exactly its section template — never improvise the format.
7. Ledger: python3 .claude/scripts/ledger.py append '{"event":"stage_iteration_iN","detail":"best=<branch>:<score>"}'

After the final iteration: select the best audit-PASS branch across all iterations, copy solution.py, eval.json, solve.log, plan.md to best/, write best/SELECTED.json {"iteration":"iN","branch":"bK","score":<s>}, append ledger event stage_discover. If nothing survived audits, report and stop.

Then Ablation: launch ablation-analyst (run dir). Expect best/ablations/{ablations.json, ablation.md}; ledger event stage_ablation. Ablations are secondary evidence for the paper — on ok: false, record the failure and continue; never let ablation block the pipeline. Show the user the final scoreboard (+ ablation deltas if present).

Next stage: /write-paper.